The National Oceanic and Atmospheric Administration (NOAA) is a good resource for the Tide, Water Level, Temperature, WInd information you need to make it safely to your destination or win that race. Remember: Be safe; FIle a Sail Plan.

A Chartplotter and GPS Navigation Software. OpenCPN is a free software (GPLv2) project tocreate a concise chart plotter and navigation software, for use underway or as a planning tool. OpenCPN is developed by a team of active sailors using real world conditions for program testing and refinement. Android devices can download the OpenCPN under Play Store.